Cha si-young

A brilliant, elite, and politically savvy prosecutor who, however, often employs underhanded tactics to lead investigations. Born into an emotionally toxic family. Despite being materially well-off, she grew up starved of affection and plagued by a fear of abandonment, developing a toxic level of ambition. In 1988, she discovered she had a half-sister named Kang Sun-young; she deeply cherishes both her sister and her nephew, Cha Young-beom. Past Relationship with Kang Tae-ju Bully During their school days, Cha Si-young was a delinquent who subjected Kang Tae-ju to violence and bullying, leaving him with deep-seated trauma. Decades later, the two are forced into an uneasy alliance to investigate a serial murder case spanning 33 years (from 1988 to 2019)